Go Back   The 75 and ZT Owners Club Forums > The 75 and ZT Owners Club Forums > Technical Help Forum
Register FAQ Image Gallery Members List Calendar Mark Forums Read
Notices

Reply
 
Thread Tools Display Modes
Old 15th February 2019, 12:30   #1
Lovel
I really should get out more.......
 
P6B, L550, Imp, F56, Commando

Join Date: Nov 2006
Location: Aberdeenshire
Posts: 2,886
Thanks: 352
Thanked 677 Times in 440 Posts
Question Intermittent Slightly Sluggish Start 1.8T

Very unusually for my runabout, these last few weeks I have been experiencing a sluggish start before the engine catches when the engine is cold. This occurs in very low outside temp and when relatively warm, perhaps 1 in 6 start ups are sluggish.

The engine runs perfectly right up to the redline once running. Excellent fuel pressure reading (not backed off or extruded elastomer at the filter housing) at shraeder valve and before the inlet manifold.

Initially I thought it was the fuel pump relay, due to my perceived lack of prime when turning the engine to ignition switch to position II, but it turns out I was getting prime. I changed the fuel pump relay out as a matter of course but this has made no perceivable difference.

I have not run T4 diagnostics yet, but now I am focusing on the cam or crank sensor. Anybody have any comments on this scenario?
Lovel is offline   Reply With Quote
Old 15th February 2019, 13:16   #2
VVC-Geeza
This is my second home
 
2005 Connoisseur SE 1.8 Turbo,2004 45 1.8 Connoisseur and my beloved 1998 VVC Coupe.

Join Date: Nov 2009
Location: Derby.
Posts: 8,746
Thanks: 2,022
Thanked 1,016 Times in 739 Posts
Default

I had a similar scenario with my 45 in very cold weather. I was in the habit of letting the fuel run very low before filling up. On occasions it struggled to start and it briefly brought the EML on. I took a fault code reading and it came back as fuel starvation and misfire on 3. I put a new set of plugs in and made sure I didn't let the tank run so low and haven't had a problem since.
VVC-Geeza is offline   Reply With Quote
Old 15th February 2019, 13:26   #3
Lovel
I really should get out more.......
 
P6B, L550, Imp, F56, Commando

Join Date: Nov 2006
Location: Aberdeenshire
Posts: 2,886
Thanks: 352
Thanked 677 Times in 440 Posts
Default

Quote:
Originally Posted by VVC-Geeza View Post
I had a similar scenario with my 45 in very cold weather. I was in the habit of letting the fuel run very low before filling up. On occasions it struggled to start and it briefly brought the EML on. I took a fault code reading and it came back as fuel starvation and misfire on 3. I put a new set of plugs in and made sure I didn't let the tank run so low and haven't had a problem since.
I run the tank until the gauge is close to empty on all my 75’s and never had an issue of fuel supply to date. However the scenario occurs whether full or empty.
Lovel is offline   Reply With Quote
Old 15th February 2019, 16:12   #4
zedhed
Posted a thing or two
 
zt saloon turbo

Join Date: Sep 2015
Location: Tipton
Posts: 1,461
Thanks: 1
Thanked 167 Times in 132 Posts
Default

Would have thought it was quite normal in the cold weather tbh.


Sent from my iPhone using Tapatalk
zedhed is offline   Reply With Quote
Old 15th February 2019, 16:53   #5
Lovel
I really should get out more.......
 
P6B, L550, Imp, F56, Commando

Join Date: Nov 2006
Location: Aberdeenshire
Posts: 2,886
Thanks: 352
Thanked 677 Times in 440 Posts
Default

Quote:
Originally Posted by zedhed View Post
Would have thought it was quite normal in the cold weather tbh.


Sent from my iPhone using Tapatalk
In the most extreme cold days (we get lots of them up here) it starts on the button exactly the same as on a hot day.
Every now and again I get a little delay before it fires up independent of whether it is cold or hot outside temperature.

Last edited by Lovel; 15th February 2019 at 16:56..
Lovel is offline   Reply With Quote
Old 15th February 2019, 17:59   #6
COLVERT
This is my second home
 
R75 Saloon.

Join Date: Feb 2009
Location: France/or Devon.
Posts: 14,003
Thanks: 3,851
Thanked 2,167 Times in 1,816 Posts
Default

Sluggish starts ???----You've not mentioned the battery.


Bit low on charge ???

Needs at least 12.8 volts for a fast start. Multi-meter time.---
COLVERT is offline   Reply With Quote
Old 15th February 2019, 18:21   #7
Lovel
I really should get out more.......
 
P6B, L550, Imp, F56, Commando

Join Date: Nov 2006
Location: Aberdeenshire
Posts: 2,886
Thanks: 352
Thanked 677 Times in 440 Posts
Default

Quote:
Originally Posted by COLVERT View Post
Sluggish starts ???----You've not mentioned the battery.


Bit low on charge ???

Needs at least 12.8 volts for a fast start. Multi-meter time.---
The motor turns over as fast as ever, it just needs a fraction of a second more to start to my ear, and something is going. It never failed to start in the recent minus temps we had constantly up here for some weeks. However I agree a good battery can make all the difference, and you may be right The battery is some years old and this may be a factor.
Lovel is offline   Reply With Quote
Old 16th February 2019, 13:28   #8
Lovel
I really should get out more.......
 
P6B, L550, Imp, F56, Commando

Join Date: Nov 2006
Location: Aberdeenshire
Posts: 2,886
Thanks: 352
Thanked 677 Times in 440 Posts
Default

12.1v this morning so a new battery it is then.
Lovel is offline   Reply With Quote
Old 16th February 2019, 14:41   #9
Yorkshire GOC
I really should get out more.......
 
Yorkshire GOC's Avatar
 
Rover 75 connoisseur se v6 auto

Join Date: May 2014
Location: Hull
Posts: 2,057
Thanks: 1,842
Thanked 623 Times in 469 Posts
Default

Quote:
Originally Posted by Lovel View Post
12.1v this morning so a new battery it is then.
Pleased to have seen this post - my car has been slightly hesitant on startup - nothing on OBD - so just been out with the multimeter - and it reads 12.10 -12.11 - so a new battery - a bit miffed as the battery is a Varta and only just over 2 years old.
__________________
She came off the Longbridge Line on 20-05-2003

The Silver Machine was the 13th of 160 Rover 75's to come off the production line that day and is the 100th of 527 Starlight Silver Rover 75 2.5 V6 Connoisseur SE Auto saloons listed in the build records produced world wide.
Yorkshire GOC is online now   Reply With Quote
Old 16th February 2019, 15:11   #10
roverbarmy
This is my second home
 
roverbarmy's Avatar
 
Roverless + 1.7D Sportage

Join Date: Aug 2014
Location: East Norfolk
Posts: 7,022
Thanks: 729
Thanked 2,021 Times in 1,449 Posts
Default

Inlet manifold gasket leak comes to mind. Any misfire and white smoke on start up? Things usually clear once the engine warms and the coolant is expelled from the cylinder/s.
__________________
Oil in my veins!
roverbarmy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 10:55.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © 2006-2023, The Rover 75 & MG ZT Owners Club Ltd